I know that Martin was in Bradley County in later census years, this is the only entry for a Langston in Bradley in 1840 and no Martin Langston appears in Sevier County in 1840. I feel confident that this is my Martin.

Martin Langston (42) appeared as head of household. He was a farmer with $6,000 in real estate. He was born in Tennessee. The household included Mary (33), Mariah (19), Elizabeth (15), George W. (10), John L. (8), William H. (5), James M. (2).

Martin Langston (50) appeared as head of household. He was a farmer, with real estate valued at $6,000 and a personal estate valued at $2,400 (neighborhood averages were $5,125 and $2,340, respectively). He was born in Tennessee and was literate. The household include Polly (41), John L (18), Wm H (15), Jas M (12), Edward A (8), Sarah (6), Francis (4), Mary (1), and Francis (79).

Martin Langston (61) appeared as head of household. He was a farmer with real estate valued at $3200 and a personal estate worth $1,000. He was born in Tennessee. He was literate. The household included Polly (50), Edward (18), Sarah (16), and Frances (14).